Elevator safety device



A. 1. BARRETT.

I ELEVATOR SAFETY DEVICE. APPLICATION FILED AUG.23, l9'l7. RENEWED NOV. 3, 1919.

13849,:313. P tented A g- 10,1920.

INVENTORY ATTORNEY WITNESSES UNITED STATES PATENTOFFIICE.

ANDREW J. BARRETT, OF BRITANNIA BEACH, BRITISH COLUMBIA, CANADA, ASSIGNOR 0F ONE-HALF TO GUST BERGQUIST, 01E SEATTLE, WASHING-TON.

ELEVATOR snrn'rv DEVICE.

Specification of Letters Patent.

Patented Aug. 10, 1920.

Application filed August 23, 1917, Serial No. 187,910. Renewed November 3, 1919. Serial No. 335,484.

To all whom it may concern:

Be it known that 1, ANDREW J. BARRETT, a citizen of the United States, residing at Britannia Beach, in the Province of British Columbia, Canada, have invented certain new and useful Improvements in Elevator Safety Devices, of which the following is a specification.

This invention relates to new and useful improvements in safety devices for elevators and the principal object of the invention is to provide means for preventing the move ment of the elevator while the door of the shaft is open.

Another object of the invention is to provide means for locking the starting means of the elevator against movement while the door is in open position, said means being moved out of locking position by an electric current, the circuit of which is completed by the closing of the door.

A further object of the invention is to provide a solenoid having its armature forming the lock, which engages a part of the starting means of the said elevator, which connects the elevator connected there with and operated by the movement of the door.

A further object of the invention is to provide means for manually releasing the starting mechanism from the locking means when desired.

Another object of the invention is to provide a device of this character, which is simple and durable in construction, reliable and efficient in operation and one which can be manufactured and placed upon the market at a minimum cost.

The invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specificallypointed out in the appended claim.

In describing my invention in detail, ref erence will be had to the accompanying drawings, wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure 1 is a diagrammatic view of the invention.

Fig. 2 is a plan view of the bolt receiving part of the lock on the operating means.

Fig. 3 is a section on line 3-3 of Fi 2.

' Fig. 4: is a section on line 4:4: of Fig. 2.

In these figures 1 indicates generally a part ofthe starting mechanism of an elevator,-while2 indicates the bolt receiving part of the look. This part is so located that it will be in its uppermost position when the operating mechanism is in the stop position. The part 2' consists of a plate having screw receiving openings 3 therein for securing the plate in position and having side flanges 4. Each of these side flanges is provided with a pair of inwardly projecting lugs 5 which are spaced apart as shown in Fig. 2. A pair of leaves 6 are hinged to the bottom of the plate 2 in such a manner that when they are in upri ht position they will engage the inner sic es of the lugs and said lugs will hold the leaves at right angles to the plate as shown in Figs. 2 and 3. The hinges for the leaves are formed of coil springs 7 located on pins 8 pivoting the leaves to the flanges 4: and said springs will hold said leaves in vertical position with their upper edges in contact with the lugs. Thus an inclosed space or trap is secured, the sides of which are prevented from moving outwardly but which may be sprung inwardly as shown in the dotted lines in Fig. 3.

The bolt part of the apparatus is formed by the solenoid 9 whose armature 10 engages with the trap, before described and acts as the bolt part of the lock. I place contact pins 11 on the edge of each door 12 and these pins, when the door is entirely closed, will pass through openings 13 in each of the door frames and engage the spring contacts 14: and thus complete the circuit 15 and thus energize the solenoid to lift the armature out of contact with the trap on the'operating means of the elevator. When the elevator is stopped and the door opened the circuit will be broken and the armature will engage the trap and thus prevent movement of the elevator until the door is closed. If the circuit should he accidentally broken and thus lock the elevator against movement, the lock may be rendered inoperative by pressing the leaves 6, on to the. plate so the armature 10 may pass freely over the same.

My locking device can also be mounted in the case of rope operated elevators upon the operating parts of the machine at the Source of power.

It Will be seen that it is practically lI Ilpossible to start the elevator While a door is open and the leaves 6 are projected across the path oi the lock member 10, thus eli'mi-' nating the danger of a person Walking through an open door and falling into the elevator shaft.

Itis thought from the foregoing that the advantages and novel features of my in vention Will be readily apparent.

I desire it to be understood that I may make slight changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall Within the scope of the appen'dedclaim.

I claim as my invention:

NORMAN C. STEUART, GUST BERGQUIST. 

